87040561 has 4 divisors (see below), whose sum is σ = 92160612. Its totient is φ = 81920512.

The previous prime is 87040559. The next prime is 87040607. The reversal of 87040561 is 16504078.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27457600 + 59582961 = 5240^2 + 7719^2 .

It is a cyclic number.

It is not a de Polignac number, because 87040561 - 2¹ = 87040559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87040531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2560000 + ... + 2560033.

It is an arithmetic number, because the mean of its divisors is an integer number (23040153).

Almost surely, 2^87040561 is an apocalyptic number.

It is an amenable number.

87040561 is a deficient number, since it is larger than the sum of its proper divisors (5120051).

87040561 is a wasteful number, since it uses less digits than its factorization.

87040561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120050.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 87040561 is about 9329.5530975497. The cubic root of 87040561 is about 443.1736126671.

The spelling of 87040561 in words is "eighty-seven million, forty thousand, five hundred sixty-one".